view-transition-name-on-document-root.html

<!DOCTYPE html>
<html>
<title>View transitions: view-transition-name is limited to document root</title>
<link rel="help" href="https://drafts.csswg.org/css-view-transitions-1/">
<link rel="author" href="mailto:[email protected]">
<link rel="match" href="view-transition-name-on-document-root-ref.html">
<head>
<style>
.foo {
  position: fixed;
  left: 0;
  top: 0;
  background: red;
  width: 100px;
  height: 100px;
  z-index: 1000;
}

.bar {
  position: fixed;
  left: 50px;
  top: 50px;
  background: green;
  width: 100px;
  height: 100px;
}
</style>
</head>
<body>
<script>
const extraHTML = document.createElement('html');

const foo = document.createElement('div');
foo.className = 'foo';

const bar = document.createElement('div');
bar.className = 'bar';

extraHTML.append(foo);
document.body.append(extraHTML, bar);
</script>
</body>
</html>

chromium/third_party/blink/web_tests/external/wpt/css/css-view-transitions/view-transition-name-on-document-root.html